java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.android.gms.auth.api.signin.GoogleSignInAccount.getIdToken()' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'java.lang.String com.google.android.gms.auth.api.signin.GoogleSignInAccount.getIdToken()' on a null object reference

      at android.app.ActivityThread.deliverResults()
    2. Android Platform
      ActivityThread.handleSendResult
      1. android.app.ActivityThread.deliverResults(ActivityThread.java:4053)
      2. android.app.ActivityThread.handleSendResult(ActivityThread.java:4096)
      2 frames